I've bought two from a company called BatteriesPlus or Batteries & Bulbs since they changed their name. They have lots of locations around the country and the batterys are priced right.
Most of the guys I ride with here in HOT AZ say no matter what they do they only seems to get 2 years, whether they trickle charge or not and it doesn't make any difference where they bought them.
Retired law enforcement
2012 Victory XCT,
floor board skid plates,
tankslapper 3M paint protection.
Magic Strobe modulationg trunk brake lights
2" pull backs
Russel Day Long seat
Kriss Industries Headlight modulator
Doran tire pressure monitoring system